No abstract is provided for this article.
Water adsorbs molecularly on a clean Zn(0001) surface; on a surface covered with atomic oxygen, however, hydroxyl species is produced due to proton abstraction by the surface oxygen atoms. Methanol, molecularly adsorbed on a clean surface at 80 K, transforms to methoxy species above 110 K. On an atomic oxygen-covered surface, adsorbed methanol gives rise to methoxy species and water, the latter arising from proton abstraction. HCHO adsorbs molecularly at 80 K on both clean as well as oxygen-covered surfaces and polymerizes at higher temperatures. Formic acid does not adsorb on a clean Zn surface, but on an oxygen-covered surface gives rise to formate and hydroxyl species.
The reaction of a single amine phosphate, piperazine phosphate, with ZnII ions is shown to yield a variety of open-framework metal phosphate structures. It is noteworthy that the reaction of this amine phosphate with ZnII ions yields a hierarchy of structures, including the linear chain, layer and 3-dimensional systems. Of particular interest is the isolation of the linear chain structure consisting of corner-shared four-membered rings, which has been considered to be the primary building block. By the reaction of piperazine phosphate with CoII ions, we obtained a new strip and a layer structure. Reaction of piperazine phosphate with SnII yields a layer structure. The significant role of the amine phosphates in the formation of open-framework metal phosphate structures is also supported by the isolation of a monomeric four-membered zinc phosphate, which on heating transforms to an open-framework structure.
No abstract is provided for this article.
Precursor solid solutions provide convenient routes for preparing complex metal oxides. Hydroxide solid solutions of the general formula Ln 1−x M x (OH)3 (where Ln = La or Nd and M = Al, Cr, Fe, Co, or Ni) and La1−x−y M′ x M″ y (OH)3 (where M′ = Ni and M″ = Co or Cu) crystallize in the rare earth trihydroxide structure and can be decomposed at relatively low temperatures to yield complex metal oxides. Several oxides of the type LaNiO3, NdNiO3, LaNi1−x Co x O3, and LaNi1−x Cu x O3 have been prepared by the hydroxide precursor route. Thermal decomposition of cyanide precursors of the type Ln[M 1−x M′ x (CN)6] · 5H2O and Ln 1−x Ln′ x [M(CN)6] · 5H2O yields the quaternary oxides which are not readily made by ceramic methods. Nitrate solid solution precursors of the type Ba1−x Pb x (NO3)2, Sr1−x Pb x (NO3)2, and BaSrPb(NO3)6 have been used for preparing several interesting oxides such as BaPbO3, Ba2PbO4, and BaSrPbO4.
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNew Metal Disulfide NanotubesManashi Nath and C. N. R. RaoView Author Information Chemistry and Physics of Materials Unit and CSIR Centre Of Excellence In Chemistry Jawaharlal Nehru Centre for Advanced Scientific Research Jakkur P.O., Bangalore 560 064, India Solid State and Structural Chemistry Unit Indian Institute of Science, Bangalore 560 012, India Cite this: J. Am. Chem. Soc. 2001, 123, 20, 4841–4842Publication Date (Web):April 25, 2001Publication History Received13 February 2001Published online25 April 2001Published inissue 1 May 2001https://pubs.acs.org/doi/10.1021/ja010388dhttps://doi.org/10.1021/ja010388drapid-communicationACS PublicationsCopyright © 2001 American Chemical SocietyRequest reuse permissionsArticle Views2078Altmetric-Citations221LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose SUBJECTS:Carbon nanotubes,Disulfides,Nanotubes,Redox reactions,Transmission electron microscopy Get e-Alerts
The Indian Institute of Science at Bangalore is probably the oldest institute in India, established with a donation from the great industrial visionary Jamsetji Tata over eight decades ago. It has gradually become a key centre of scientific and engineering research and higher education. From its very inception the institute had an interdisciplinary approach to research and teaching.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIndo-U.S. conference on chemical education: Design for innovationG. S. Hammond , V. Ramakrishna , C. N. R. Rao , and M. Tamres Cite this: J. Chem. Educ. 1970, 47, 1, 36Publication Date (Print):January 1, 1970Publication History Received3 August 2009Published online1 January 1970Published inissue 1 January 1970https://doi.org/10.1021/ed047p36RIGHTS & PERMISSIONSArticle Views81Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (3 MB) Get e-Alertsclose Get e-Alerts
Nitrides such as Si3N4 and GaN are made by the reaction of the respective oxide with N2 or NH3. In order to understand the mechanism of formation of nitrides, reactive laser ablation of B2O3, Al2O3, Ga2O3, and SiO2 in pure form, as well as in mixture with carbon, has been carried out in an atmosphere of nitrogen or ammonia in a pulsed supersonic jet. The reaction of N2 with SiO2 gives nitridic species such as Si2N y (y≤5) in the vapor phase. On reaction with N2 in the presence of carbon, B2O3 and Ga2O3 yield species of the type B x N y and GaN y , respectively. Nitridic species are preponderant in the reaction with ammonia only in the case of SiO2. Al2O3 predominantly gives oxynitridic species under the reaction conditions examined.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
We have been able to prepare nanoparticles (∼4nm diameter) of cubic γ-Mo2N by a simple procedure involving the reaction of MoCl5 with urea at 873K. The nanoparticles show a superconducting transition around 6.5K. The γ-Mo2N nanoparticles are readily transformed to nanoparticles of δ-MoN with a slightly larger diameter on heating in a NH3 atmosphere at 573K. Phase-pure δ-MoN obtained by this means shows a superconducting transition around 5K.
No abstract is provided for this article.
13C NMR spectra of a few odd-member alkane dicarboxylic acids such as glutaric and pimelic acids have been studied across their phase transitions. The spectra provide clear evidence for the structural changes accompanying the transitions. In the case of malonic acid, the study establishes that the two carboxyl units are equivalent in the high-temperature phase unlike in the other odd-member dicarboxylic acids where they are non-equivalent.
